| 1 |
The colloidal particles in raw water can be removed by |
- A. Coagulation
- B. Aeration
- C. Chlorination
- D. Hydration
|
| 2 |
The main pollutant of leather tanneries in the waste water is due to |
- A. Lead
- B. Chromium VI
- C. Copper
- D. Chromium III
|
| 3 |
In purification of potable water the coagulant used is |
- A. Nickel sulphate
- B. Copper sulphate
- C. Barium sulphate
- D. Alum
|
| 4 |
The main pollutant of leather tanneries in the waste water is due the salt of. |
- A. Lead
- B. Chromium (VI)
- C. Copper
- D. Chromium (III)
|
| 5 |
The yellowish colour in photochemical smog is due to the presence of. |
- A. NO
- B. NO2
- C. SO2
- D. CO2
|
| 6 |
The mean residence time of methane in atmosphere in |
- A. 1-2 years
- B. 3-4 years
- C. 3-5 years
- D. 3-7 years
|
| 7 |
How much fresh water is used for domestic purpose |
- A. 8%
- B. 23%
- C. 69%
- D. 100%
|
| 8 |
Ecosystem is smaller units of. |
- A. Lithosphere
- B. Hydrosphere
- C. Atmosphere
- D. Biosphere
|
| 9 |
Fungicides are teh pesticides which |
- A. Control the growth of fungus
- B. Kill insects
- C. Kill plant
- D. Kill herbs
|
| 10 |
The smog which have high contents of SO2 in it, is called. |
- A. Reducing smog
- B. Oxidizing smog
- C. Natural smog
- D. Neutral smog
|